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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b436a85d7fc67659191ec667e1735641141ed37ada5a481a68ab747703254c2' 
  AND token = 'M9ZMkU310pL5e279YbGR97Wdyqr0euXQgRrS6KRyZwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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