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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5c40dbaf714153ed7dc142c54e3af1ee5af026ad7ff822922c2326d7e34655' 
  AND token = 'Nhj4OcIMFTckWZdB00jYju4WfwprOtoZtusuhy61CQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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