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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd626302661d4f3d1e52e35fff1faec3403f31de7be63a215da04366c38f291f9' 
  AND token = 'diMMkP5Umm8pB6q02aT54Uk4c3V0qebop/yoNgUrqDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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