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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1c87d9598bb0265d1ccbdc18e4cc298c031af6167edab5a4fa470647a691e6' 
  AND token = 'hIdIqTWR9Req9S5XufEMTM9NVvvtcfR1u8uNWjrRhvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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