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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa5fc3e1a338817631f6ab23be58afe24548a10282216c110b6351a5c3f9899' 
  AND token = '1NKMnsbcaQbJF738Vg0w6Nx2p7XfdxGHgaAzNR7AlHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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