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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092ea3f481385ad4c566e05f2ff1fd64509be566d1d5d61dde077f4d02c499b6' 
  AND token = '6sxOUXiZwno9GlAzqx5SMDu1XVEP+7B0XqjCmMabsYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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