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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15871580d49630fc58015eeab47d9d85c1cdc0c0cd62599b17149bb1c404b31' 
  AND token = 'smK6z9FruSGQbpNf1wNhJ/OHPPBk4AGrSszKfmFW0M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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