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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ba14a153f3d15ddcf7856b26ad51364ec8714bc04c2ca08f7610440e0d90d9' 
  AND token = 'lmo1HwUf0k2ONApq6NWt8uLrO91rud3HZzW8Jvr1oY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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