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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c4c24d43014257f338ef17976d7d5137fb33ef979e4b861d763741549df398' 
  AND token = '4OGfmOdnavnphmWIWIqj+pe+0TmTTGX4gkHpgdJGpv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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