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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bd3f79445d55cb29262bdcc9119c8ecba4a0fdfb846a8c389623b3b431f2e2' 
  AND token = 'jsEia+G5dNgp6f5SJimU0Gh6dC5Q4s0xdWjNephiDDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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