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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138094e73c8f7e8c7a8cd06811f1b9ba82bf6d6b4396b605705adb3366a6c3ef' 
  AND token = 'LRKy0rwnvOuY84rJWGlvQz6fvebJK2nF8C3uns6Ng50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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