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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768bbf8b079668581e562d2d53b68c90c612cdadc1aa50a6d5629c23dd502d07' 
  AND token = 'r6tfQTADV4i/7HebgkdctQkg2A60kQ+juxtqRiSNN3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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