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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209704ac1f4cd02e108764da646225cbb62e4fd49e5882a3b8529708c82327f4' 
  AND token = 'vs7j5kfZPsmDYuTYXMK5/s0RfnCNFEMzQVHpM14BH9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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