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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f25dc586a840ed1d0cf74a63440e73f12d3ef46818e2ed5b235b00d062d94a' 
  AND token = 'gZraSmG/vD2lpv91/6zmd44nnzZvlFRBspj3zTzsoWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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