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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7bdbee9833d5fe12c241bb46e7c2d86cecb8f0b9c7806e66d695533787fe47' 
  AND token = '9yCxfjNuWd8NYTvACJO4SIOrWMX7mhmGPOnnupJ+lXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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