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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0304e08328c451fa80f3932cfde4de50ce2ab3ca04d21f60878ca5aa8f600d' 
  AND token = 'mLE4wbckyCmR5eQxBrlvQuSqqmMfCvzPM+AsCWeA2BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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