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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26592207b1d57e8080f6e5f90da8e5cc062c644f2469120b9d9eefe56bbaa11d' 
  AND token = 'f9iVsRKpQ6HM3P5YT1z5sjwb6N3XFH/C47v4Ce37KW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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