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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968db71e228f007aea340d2e20e7122a01964afa190b5910fc0e602131eae979' 
  AND token = 'd5mgqhxRCgP5Qj1zBYVMnS3MoZTDQ7jcOhk1+QJKHMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}