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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24906828cfd721be6620c235ff4c783b071540c785ab65e44b48dfc24e0ec94d' 
  AND token = '9Mphf9M5wnUltrYAj9EbOyC1cLEIwST1HTLJqetV5OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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