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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34635bcfe20a5b6065661668b059cda0fe027b58c2fae6f1e3382bb942c9fd28' 
  AND token = 'mvtcCl33Bm/uzuFetgIUiEVmzV+Zaq5JDfBbXu3gAyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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