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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7630eef28d4b8437af8beb4ee3cca60db4c4b8fa13a4c6e92e92ab596639d688' 
  AND token = 'w76bzIIqEJxFMASkZcADikKZvocxM7ltaL+6BXZp4yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00311

JSON explain

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