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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06ebaaa5b4b471caf5fbc806e3dbf633df7cd76c73694cddd77e39a22f62226' 
  AND token = 'kAfbBWlkDUmYy90c+fM5v+UXQze7boJ68q8fHxi81Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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