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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3270d7563f1e8c3caf293f5a0e73a2a2b59dcbb4868a15e3b25b30e529659c5' 
  AND token = 'Lc2Zj26IznAAGc3TsiPhTxcj7mORElJT0/f+FZk+ZlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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