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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68db3e165d69eabb6201ea793848fc6d683206a51b3b9d4bbc2a19571b61d567' 
  AND token = 'nV+34DO+jYoUfjjN3qdnCMzQvxyd7WrOtKy/J9+4cew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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