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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac9167fe0643db6d690759d6caa08817fc39a78bba543560675f3e9de2167cf' 
  AND token = 'xFqPL8111bGsXPuQxs5D4TIQfcOWBtgNYbDp6bVBO8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00318

JSON explain

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