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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb1614a1bf826b13a5d61464c68cedf8b31abc9c7b0875216fe78a5f69424e4' 
  AND token = 'YLKJ/4bMT3mxXQnZVGe9oYdat1ESPjEFu2ump3CrBc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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