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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52b0cbaf7aad5b06ef6b35744a7bf7baaaba6807f234666c85804cd528392f3' 
  AND token = '+oJHvfu5P7y4i0zpaS8fwRjN91iQRehL++XhQ0afQ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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