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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba0f991a0e6ec861186708d21dd4787e8e7afb454419a0ef6220dab40ce3196' 
  AND token = '3yASinVP8iDV8Z1lCe0vsfqpo0rnGvD6KbPxI8sdn5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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