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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6999c5207ca1f488897ef3a7aa0b0163b4834067de525fd018675a9e32b7cfcc' 
  AND token = 't3gUDEdy2S+Xtbg47vQ1pl5Xgxbd2YekNbM/bE/HHtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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