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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3b71995194276829e06a9113ad9451b7798e0b203eede2831652119cac89d7' 
  AND token = '59Ld+nVHHAP7gk2GG9Ppan3T2c+DtMyuW4DjG9Xi6pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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