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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff75d065e47835c7712ebf04f0fc6678f589c259cc804d6a1a89109c2738957' 
  AND token = 'bJWjA9OIX40z1DlP3bHlvsjNWM8yllCSw9Tda8dh7LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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