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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e09c0f149e4448dee2661c287790346363be96f98933437e0de5e15cce68db8' 
  AND token = 'zdlNRv6vdvZibSkW/K3aUE7gT7RwIHde5xN8UAXYN34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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