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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ceff74ca7bf61553e3cc8c27dbbac32a1aa119bc031a3a2db026f5f3c00d8e0' 
  AND token = 'boCvhIgZNHAMPhIvRpFeFAqBElQgD8vmD5ugRFF2um8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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