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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb7d208b0e9e9eb3f890ffea3122831a07822d22fb57d3eadd634c06685fa88' 
  AND token = 'xWzqK75vWB53gNk3DEy+Ovn1vUDHFWnBZ5OCfrKtjio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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