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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb4312ea9d0efc8ecec50043c858f44be31c8f279da7e8c23d149bb0d307b1a' 
  AND token = 'tMzh00JeEeJDLN0BmP9eqscxG5un66u7cG5hM08XxZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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