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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ebc39a6a7d1a8537af11f6b360c7d497fbe993073cd6326115d5ad7cb505ba' 
  AND token = 'TKjCdLq+5etoMgV3CfPicfJhUsWdDS0BkDMzKvck3n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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