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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3711845c8386173ee22c66be24b54ce08ce4c17c70e5410eb512f18f5a6912' 
  AND token = '6+J1NpbiQbLZYRxStrcnE04PJN7XEo7rH90L5eg0lSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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