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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd03aef7d5a8fc2587869218dcde8c97a32213a0c052f7ddcafbe7e32d917b4c' 
  AND token = 'iI/VqTOaA4edOX9Am2Li3MFouWXOdxEMsB6N//cKiMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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