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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a630b53a52b1c8a1d1762b109eece713987bd9f7d12488b3be5fd28048eeb1' 
  AND token = 'l9yTQcNrJj2KbSkyyv4lKY90noeW6vblj5QYBKXRjBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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