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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a832a9d3da282af242057ac369508754e141564d33ef919b78c13804f07c6158' 
  AND token = 'uftF6CYK8ERqNcM/qBVwLr2UVMB1O9ORH09UUb81I98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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