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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db80e4dc38ba8827c116b687138d5c3356e34e6d5ef5e7f5fa3aaad9317245ec' 
  AND token = 'RFWxp5oeqYVJL1ti20yjRrW2GfnB9ffl3fjUQf6WWZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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