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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3771f41cf07ed38ef503012831808635085912165fca16a69053bd7e5196aa63' 
  AND token = '0V6+AbpjyHt606E0a7JXB8weMrFOvK2cAynA1Oe6duY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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