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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b7fe32f0987fb8965c351c72115f938d58130ef329d128b301fd3295607dd0' 
  AND token = 'jnruvv36OjZmHw4WIuco7GvmwDuIHDioqZmiS2ksaBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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