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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a07d6af059c75632818538b3dcabfb5361c37836b816d1c5fdac0be68aeb16' 
  AND token = '74rsHZ4W+2F1IeXisQvlTC5LPIal9GcmskAJT6zuX8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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