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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b104fe446e86c07d996c457a15afff01749a6a241b19bfe429885758bcd8232e' 
  AND token = '2Xc/wGJZuTOw4wnoTKJESeQlZyJcHxNxfX/s6N/Oh90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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