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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd6327fc4ba37b74d42377828101343c7dd1713df92907daedaa91846bf2f77' 
  AND token = 'UTjf2iiqNzWs2jL7cGoFKRH+99HeA+3q0Ww02iyOQC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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