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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b98f5a85ef06296464c505b8936dd89f80541b89e971f1023926f2d6e3c3820' 
  AND token = '8xRrzUNLByEbeaXDS1DOzjOxFpjoxCswxPd2r4lbidY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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