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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b2b14ee9b210f7850ad37d362abebbf55c534b75c45c9e10c6ed8a2277800a' 
  AND token = 'ndOLsYUGYtToDheyADGjDtgoaGoKqUS/ftyY2uvVT/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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