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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bba914901ea506aa668c0dd21fe166312504ba336ae95533e2c6afba709b471' 
  AND token = 'm/moscIgbMXtD6G1286YMXD6Uh0y6bgg4GNvg1vagEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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