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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30b9a5f5ab689be03a12e170a04af99f3f4f5b3dc1ddfa6762a15177e9576dc' 
  AND token = 'tp7c2x/EPvjuaBjb4dXuCMlXk5HAtIbP6Ln9EUE8mJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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