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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975fae8417ee1ba5541e565958f54694dcc89e292bb91f96e91eae39d4509014' 
  AND token = 'X98AytkIjaownDlcaRfyex3ZkL11PHG9LFISKgNBdUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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