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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78211ce25f143dae2b9c713c9b6d62568a5b75d98fb8fb1966dd01471e6e34b' 
  AND token = '98ADOz/wymh0tJfPck+DBOsTE4iCz7XYY+yAUTYBo1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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