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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d7fdea2e312ef2e746c66718260aa229b595319be004fb0268db3abb0add36' 
  AND token = 'Rcpn//JRGze3dy2HGQxRJr3DRciYDdifxuVddx0cIm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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