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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d5053e1c0143344dec3c0c1a319c1a44d7a9c7fae66f6da11cfe021a5d6023' 
  AND token = 'Bm/VY80gwU+cTk7Ai5zVrcZk5k+KU0WdsoYA6ELEABQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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