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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5f28f879fe3852d90531437d3c710c5e0f03344c9413aab31a1645c4a36b95' 
  AND token = '8upndYs56etYkv4FQGo7QOslgxoWfbX4wG6JsBysJu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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