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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7fd4912e7b43939f87a1fe0c3885dd8c2cf92164ccd3bbc80e1c0b165680a0' 
  AND token = 'QEY352QVcE6EOB1h9lTqoJPHW70JAtXjmUok36V/DWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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