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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317aca9bd7771c2a42cec1b8ac81953d7a44086f797e74801191a36683f8acc7' 
  AND token = 'x2NW0DzXhAJX0wWsCySRvdpA9F+IvmUKFCylM1PW+2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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