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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8071684a7bbde956c86a273cfe85106dd14e61d616efc0ed2f047e02633fdc' 
  AND token = 'VpVMUXynCwE1MpqndeKz+3P4JvtsAiwhn1VIFkEjdLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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