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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94fc8e99245098c2cf2c4b38ea6cd619e112933f86b51d4032a1ca945e06068' 
  AND token = 'VMbnJsdp7jNv9JXRbUg62Jr3GTRE/9O4ln2576eEQOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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