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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6abb2a541ecb94774289cab781bb377532cb3d2626550fbb445c5f36da6d84' 
  AND token = 'JDB+sY3mDivfby8bVYo0DLEsF2geIyiAatDr9wdHo5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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