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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8d3af7c138c89a32c4c19a276e0785db8f2c97eb9e5b9aeb61e4dca7d3b9db' 
  AND token = 'J1207sx1sWSIPAJnskHi8lAlOMXBsjhg1Z4y9LmL2tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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