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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5236fab34ecbfe7347a338d89a284828aeda6664528ff2ca7d956402bf87ce10' 
  AND token = 'KS87xt9eOvHE7eisORCZYOS4tjb+zQPpPdEJRMpQm14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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