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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459bdc20123e7e014f2ae5349a819e227a10e64df0488f0caf3b58a72d99afdd' 
  AND token = 'T8wA9CgCuPEwN0NMTHdT+x+fz902LVAHn3fF1Jt4QKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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